I can’t recommend Adguard DNS. Routing is very bad and it always leaks DNS. You can see my previous posts about it. NextDNS is the better option but it is in maintenance mode and don’t expect any new features. Control D is better than NextDNS but it lacks POPs compared to NextDNS. Featurewise CD has the most, and support team is very responsive.
For VPN, I find Proton and Windscribe fastest ones, Mullvad is mediocre and IVPN is the worst. I never used Adguard VPN as paid option, so can’t comment on it. If you need IPv6, Mullvad and IVPN are the only choices. Proton released IPv6 on Linux client but not on Windows, Mac and mobile clients. Proton also lacks DoH/DoT support. Windscribe doesn’t support IPv6 and they keep quiet about it when asked. Their clients support DoH/DoT unlike Proton.